CVE-2005-2534: Openvpn

Low severity, CVSS 2.6. EPSS: 1% chance of exploitation in the next 30 days.

Race condition in OpenVPN before 2.0.1, when --duplicate-cn is not enabled, allows remote attackers to cause a denial of service (server crash) via simultaneous TCP connections from multiple clients that use the same client certificate.

Affected products

• Openvpn Openvpn: version 2.0 only; version 2.0.1_rc1 only; version 2.0.1_rc2 only; version 2.0.1_rc3 only; version 2.0.1_rc4 only; version 2.0.1_rc5 only; …

Published 2005-08-24. Last modified 2026-06-16.